The NAF-30 is categorized as an EU 4/5 rating filter. Average efficiencies may vary 5 points.
The media shall be of high density of 100% PES and flame retardant Fl according to DIN 53 438. The filler media shall have an average efficiency of 30% - 40% on ASHRAE Test Standard 52-76.
It shall have an average resistance of 98% in accordance with that test standard.